Agnès Dormes, a famous opera singer, saves Julie, a baby girl who was about to be sacrificed during a black mass. Twenty years later, the baby has turned into a beautiful energetic twenty-year-old young lady determined to find out about her origins. In Avignon, Julie manages to meet Agnès and discovers on the occasion she is not her real mother. A series of adventures will ensue and at a time Julie is nearly burned on the stake. But she eventually achieves her end and can marry, a street performer close to her heart.